Hi there ebdb!
I have an article here for you that might be able to help you with this issue:
Specifically, it seems that this section at the end of that article may have some helpful information for dealing with this:
Are Windows 7 and 8 using Boot Camp supported on the Retina display?
Yes. You will need to download and install the Windows Support Software using the Boot Camp Assistant to use the Retina display with Windows 7 and 8. For more information see the Boot Camp Installation & Setup Guide.
Windows 7 starts up with a lot of space and small icons. Is this normal?
Yes. Using the Apple-supplied Windows Support Software, Windows starts up with the maximum dpi (pixels) it supports (144 dpi, or 150% magnification). This can be adjusted using the Windows Display Control Panel.
Take care, and thanks for visiting the Apple Support Communities.
Left off disable quick boot feature that does not allow Thunderbolt devices to be seen.
Boot Camp: Thunderbolt devices not recognized after Windows 8 upgrade
This more thorough FAQ
Thunderbolt ports and displays:
Frequently asked questions (FAQ)
Install the Boot Camp drivers but then go to Nvidia and get the mobility driver for your OS and device, Apple enables the chip and basic driver but not always enough or what you need for full use.
I resolved this.
Posting here in case anyone else encounters the same issue.
Steps to resolve:
- Used Apple Migration Assistant to remove the Boot Camp partition. (Started over with a clean slate.)
- Downloaded a Windows 7 Home Premium 64-bit .iso from Digital River.
(Previously, I had been using a physical DVD from Microsoft and external drive.)
This forum post has links to those Digital River downloads.
- Ran a Time Machine backup.
- Used Apple Boot Camp Assistant to set up a 16 GB USB 3.0 flash drive as a Windows installer using the downloaded .iso from Digital River.
Previously I had tried it with a USB-connected internal hard drive pulled from another computer.
It might actually matter that it needs to be a USB flash drive, and it might need to be USB 3.0.
Anyway, that's what I used this time and it worked.
Also, I plugged it into the USB port on the right side of the computer (as you're facing the computer screen). I don't know, but I've heard that might actually make a difference sometimes.
- Rebooted and ran the Windows installer from the flash drive.
- Followed the Boot Camp instructions as usual.
- There's a step in the installation process where the Windows installer asks which version you want to install and offers four different Windows versions, including "Home Basic" "Home Premium" and two "Pro" versions.
Don't accept the default of Home Basic. Deliberately select Home premium or Pro or Ultimate, or whatever you own a license for.
After that everything worked as advertised and the NVIDIA driver installed fine.
I was able to activate my OEM version of Windows 7 using the product key printed on the Microsoft DVD case I had purchased previously.
I hope someone finds this information useful.